nullreferenceexception

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How do I add a column into a data set loaded with an outdated schema in C#?

Background Here is my issue. Earlier in the course of my program a System.Data.DataSet was serialized out to a file. Then sometime later the data set schema was changed in the program, specifically a[详细]

2023-04-01 07:26 分类：问答
Ironpython: Debugging a null reference exception

I have previously asked this question when I was seeing a null pointer exception. In that case it turned out that what I was seeing was in fact a bug in IronPython.[详细]

2023-03-31 05:51 分类：问答
Accidentally changing names of the project

So I am writing an app for Windows Phone 7. Today, I didn\'t know what got into me, but I naively thought that by changing the Assembly Name, the Xap File name, the deployment Title, and the regular T[详细]

2023-03-30 14:49 分类：问答
Checking session if empty or not

I want to check that session is null or empty i.e. some thing like this: if(Session[\"emp_num\"] != null)[详细]

2023-03-30 02:16 分类：问答
WP7 Silverlight toolkit date picker throws a null ref exception when my page inherits from PhoneApplicationPage

When I use a custome page inheriting from PhoneApplicationPage instead of directly using it, the datepicker throws a null ref exception...[详细]

2023-03-29 17:51 分类：问答
I'm getting a NullReferenceException (VB.Net) and don't see where it could be coming from (dev with 15+ years of experience perhaps having a 'moment')

None of the parameters are empty/null/nothing auditAuthSuccess(UserName, olaHelper.batchID, olaHelper.authenticatedStudentIDSite)\'<-- I put a break on this line[详细]

2023-03-29 09:58 分类：问答
C# - Thread Abort and System.NullReferenceException

I am doing a practise GUI Oven program using a thread, I am not sure if I should even be doing this because I want to interact with the GUI when the Heating process is ongoing. When I try to abort the[详细]

2023-03-28 14:46 分类：问答
ignore null reference exception vb.net

I am coding in vb.net. At times the data is empty/null this is due to user\'s input into the db. i will like to bypass it, however i get no luck.[详细]

2023-03-27 22:20 分类：问答
DataGridView NullReferenceException on InitializeEditingControlValue after losing focus

I have a DataGridView bound to a List[of Parts]. The last item in the list is always a \'dummy part\', which is there to create an extra row in the grid so the user can start typing into the first cel[详细]

2023-03-27 09:46 分类：问答
Strange NullReferenceException on ExecuteReader

when I try to execute the folowing code, a NullReferenceException is raised on the ExecuteReader: static public IDataReader executeReader(string query, string connectionString, string databaseType)[详细]

2023-03-26 10:50 分类：问答